I've dealt with depression since I was so young that the doctors laughed at me and said I couldn't possibly be depressed (refusing me treatment and making things many times worse). I've tried many things to help. Sometimes I'm not able to do anything, but usually if I can find a little motivation, I can take that first step to doing something that will help, and that builds up momentum and things start to get better.
This article was the first step I took towards hacking my brain and actively making permanent changes in my life that make a real difference and keep me from sinking back into the really bad place. Also, it's funny, which helps on its own. After I read this, I proceeded to read everything that David Wong had written, and it's almost all incredibly helpful advice. Not sure if it's necessarily what you need for your situation, but it can't hurt to give it a read, with an open mind, and be prepared to reconsider some things. Worst case scenario, you'll at least get a few laughs.
http://www.cracked.com/article_15231_7-reasons-21st-century-making-you-miserable.htmlThis one is a good follow-up:
http://www.cracked.com/article_17061_reminder-5-things-you-think-will-make-you-happy-but-wont.htmlAlso, a general tip that almost universally works is exercise. It's not easy to motivate yourself to get real exercise when you're depressed, but if you can manage to start, it almost ALWAYS helps, and once you start it is easy to keep going. Just do a few push-ups or jump rope for a minute, you'll be surprised how much it can help. Think of it as hacking your brain, bypassing the chemicals that try to program you into misery, or getting XP to level up your happiness, or fighting a forgotten beast that can only be defeated by willpower (definitely picture yourself as a hero fighting against forces too strong for anyone else to face). Whatever you gotta do to get yourself in that mindset. For me, it helps to watch kung fu movies. Especially Jet Li or Jackie Chan. Or even Fight Club. Then start playing this song by Citizens and dance around like an idiot:
http://www.youtube.com/watch?v=0De1C4gqhmE (in fact, get the whole album, and make turning it on and dancing around part of your daily routine)
Hope things get better for you. If you stay depressed for too long without some kind of treatment, it can become your default state and it can be incredibly difficult to change it. You get to a point where the familiar misery is preferable to the unknown of happiness, and you actively resist getting better out of an instinct to stick to what you know. Don't let that happen.